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formats: Check and enable implementation specific readback formats on GLES

Gert Wollny requested to merge gerddie/virglrenderer:more-readback-formats into master

With 6a3cd2bd vrend: send list of readback-formats to guest

stricter format checks were introduced on GLES. This may lead to format conversions in guest and host that can be avoided for additional implementation specific readback formats. So when we build the format list also check whether a bound texture format can also be read back from the fbo and report these additional formats also to the guest.

Edited by Gert Wollny

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